Thanks for the update. Our sandbox can be a bit scattered$$anonymous$$so you might see functionality not work from time to time. But at least for the keyset creation we try to keep that up as close to 100% as we can. So we will continue to investigate.

I was able to create a sandbox keyset for user arndfritzen. We will investigate why you might have received an error but at least you are unblocked for the time being. It could have to do with browser and version being used. If you can send those details that would greatly help us. Thanks in advance.